People are lazy. So if people can buy ready-made 'joints' without having to 1.) grow it and/or 2.) sneak around, I think they will. However, there will still be huge profits to be made on a black market by enterprising individuals because anything bought on a black market has no tax on it to hike the price (we all know that here), there are less middle-man types which also increases costs, and there is ZERO paperwork which is one of the hallmarks of government venture. Plus once government gets involved, this so-called 'ready made' cash crop will plummet in value because of the sudden regulation with the USDA, FDA, EPA, the ATF will get an M added to it's acronym, and so on and so on. I don't think the USA government, if it wanted to, would have the wherewithal to corner the pot market.
I don't enjoy marijuana but I think responsible adults should be able to enjoy what they like, so I also have no horse in this race outside of advocating for freedom of choice in recreation but I thought I should bring up a few issues I've heard pointed out.